The Born and Lens-Lens Corrections to Weak Gravitational Lensing Angular Power Spectra

Details The Born and Lens-Lens Corrections to Weak Gravitational Lensing Angular Power Spectra The Born and Lens-Lens Corrections to Weak Gravitational Lensing Angular Power Spectra

2006-01-10

arxiv.org/abs/astro-ph/0601226v2

JCAP 0603:007,2006

Astronomy and Astrophysics

Astrophysics

Added references, minor changes to text. 9 pages, 2 figures

Scientific paper

10.1088/1475-7516/2006/03/007

We revisit the estimation of higher order corrections to the angular power spectra of weak gravitational lensing. Extending a previous calculation of Cooray and Hu, we find two additional terms to the fourth order in potential perturbations of large-scale structure corresponding to corrections associated with the Born approximation and the neglect of line-of-sight coupling of two foreground lenses in the standard first order result. These terms alter the convergence ($\kappa\kappa$), the lensing shear E-mode ($\epsilon\epsilon$), and their cross-correlation ($\kappa\epsilon$) power spectra on large angular scales, but leave the power spectra of the lensing shear B-mode ($\beta\beta$) and rotational ($\omega\omega$) component unchanged as compared to previous estimates. The new terms complete the calculation of corrections to weak lensing angular power spectra associated with both the Born approximation and the lens-lens coupling to an order in which the contributions are most significant. Taking these features together, we find that these corrections are unimportant for any weak lensing survey, including for a full sky survey limited by cosmic variance.

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